Metal-Air Electric Vehicle Battery
Arizona State University (ASU)
Sustainable, High-Energy Density, Low-Cost Electrochemical Energy Storage - Metal-Air Ionic Liquid (MAIL) Batteries
12/21/2009 to 06/30/2012
Most of today's electric vehicles (EVs) are powered by lithium-ion (Li-Ion) batteries--the same kind of batteries used in cell phones and laptop computers. Currently, most Li-Ion batteries used in EVs provide a driving range limited to 100 miles on a single charge and account for more than half of the total cost of the vehicle. To compete in the market with gasoline-based vehicles, EVs must cost less and drive farther. An EV that is cost-competitive with gasoline would require a battery with twice the energy storage of today's state-of-the-art Li-Ion battery at 30% of the cost.
Project Innovation + Advantages:
ASU is developing a new class of metal-air batteries. Metal-air batteries are promising for future generations of EVs because they use oxygen from the air as one of the battery's main reactants, reducing the weight of the battery and freeing up more space to devote to energy storage than Li-Ion batteries. ASU technology uses Zinc as the active metal in the battery because it is more abundant and affordable than imported lithium. Metal-air batteries have long been considered impractical for EV applications because the water-based electrolytes inside would decompose the battery interior after just a few uses. Overcoming this traditional limitation, ASU's new battery system could be both cheaper and safer than today's Li-Ion batteries, store from 4-5 times more energy, and be recharged over 2,500 times.
If successful, ASU's project would improve the safety and driving range of EVs while reducing their sticker price.
Widespread use of EVs would help reduce U.S. dependence on foreign oil. The U.S. transportation sector is the dominant source of this dependence.
This project would enable EVs that could travel from Chicago to St. Louis (300 miles) on a single battery charge, costing drivers less than $10.
Use of EVs would reduce greenhouse gas emissions, 28% of which come from the U.S. transportation sector.